Resources for descendants of Survivors to gain EU citizenship?

Hi all,

Are there any online resources to aid in researching how to gain citizenship in an EU country, as a direct descendant of Holocaust Survivors?

There are several eastern European countries I’d imagine we might be eligible for, so any guide that reviews various countries’ policies and procedures, including eligibility criteria, would be sincerely appreciated.

Specifically, looking for information on Czech Republic, Slovakia, Hungary, and Germany.

Thanks all!